Spinal cord and the Periphery Flashcards
what information is carried in the descending cords of the spinal tract
motor
where do the descending spinal tracts originate
cerebral cortex and brainstem
what are the descending tracts concerned with
control of movement, muscle tone, spinal autonomic functions
what happens to the descending and ascending tracts in the medulla
decussate to the opposite side
how many neurons are in the descending pathway
2
what information if carried in the ascending cords of the spinal tract
sensory
how many neurones are in the ascending pathway
3
what information is carried by the posterior/dorsal column
fine touch, tactile localisation, vibration sense, proprioception
where does information in the dorsal column cross over
upper medulla - pyramidal tracts
what is the main role of the thalamus
it is a sensory relay station (lateral nucleii)
what information is carried by the lateral spinothalamic tract
pain and temperature
where does information in the lateral spinothalamic tract cross over
at the level of entry
if a lesion occurs above the level of crossing over of tracts where is the deficit
the opposite side
if a lesion occurs below the level of the crossing over of tracts where is the deficit
on the same side
what is a reflex
an involuntary stereotyped pattern of response brought about by sensory stimuli